DE912909C - Method and device for ejecting pellets from their mold - Google Patents

Description

Method and apparatus for ejecting compacts from their mold The invention relates to a method: and an automatic device for ejecting compacts from their mold using the fall of the Press or the movement of the press table.

In the production of compacts, such as. B. Explosive and detonating charges, in most cases you need two presses, one press for the actual one Pressing the body and another press for expressing the pressed body from the molds. This mode of operation has the disadvantage that for the express press additional labor is required. In addition, this requires an express press Space for installation and a power source for propulsion. It has now been found This saves this express press with the necessary operation and power source can be used when withdrawing the press by holding the ejector pins to Expressing the compact is used. It will. this frees up workers, by omitting the separate pressing process, the performance increases and thus the Production costs of the compacts are reduced.

A suitable device for carrying out the invention The method consists in that in the printing plate among the: compression molds in corresponding Recesses provided for ejector pins protruding beyond the pressure plate are, the protruding parts of the Holes one opposite the press table of the movable element added «-erden, with the respective This is the position of this movable element due to the movement of the press itself is controlled that when closing the press for the purpose of compaction of the compacts in. the forms the recesses in the pressure plate with those in the movable Elements match, while this match after completion of the pressing process is eliminated by moving the movable element, so that the protruding Parts of the ejector pins when the press retracts on the movable element sit up first and then guide them into the molds as they fall further and so the compacts are pressed out of these, whereupon after completion of this Process the movable element again under the influence of the press movement returns to the original position.

The control of the device according to the invention can expediently in take place in such a way that under the mold openings of the pressure plate with a corresponding Recesses provided slide is arranged and that the press table projections in the form of cams, rollers. od. on the press housing firmly hinged lever come into engagement in such a way that the respective Slide position depends on the position of the press table.

In the drawing, a suitable device for carrying out the method is illustrated in an exemplary embodiment, namely Fig. 1 shows a vertical longitudinal section through the device at the start of pressing, Fig. 2 in the state during the pressing and Fig. 3 in the state after It means the press housing with the press table 2 and the supports 3, over which the pressure plate 4. is mounted Above the pressure plate is the carriage 8 with the movable inserts g and the molds io. In the working position according to Fig. i, these molds are loosely filled with the material to be pressed, such as explosives 4 and slider 5 both have recesses 12 and 13 for receiving the ejector pins 14. These ejector pins therefore partially protrude into the under the Druckpl atte located slider into it, provided that the corresponding openings in both parts face each other. On one side of the press housing, a bearing block 15 is fixedly attached to the roller carrier 7 and the double-armed lever 16 is rotatably mounted in this by means of the axis 17. The two driver levers ig and 2o are firmly connected to this lever 16 and the axis 17. One end of the pendulum spring 2i is suspended from the lower part of the lever 16. while the other end is movably mounted in the adjustable fork head 22 attached to the bearing block 15. The free end of the lever is connected to the slide 5 via a tab 23 in such a way that a pin 24 located in the slide slides in the elongated hole 25 of the tab. In. The press table 2 is also fitted with the two roller holders 26 and 27, which are opposite the lever ig and 20, respectively.

The operation of the device is as follows: After the Preß.formen io are filled with molding compound; the carriage 8 on the press table is driven onto the pressure plate ..., up to a stop 28, so that the holes in the molds are exactly above the holes 12 in the pressure plate in which the ejector pins 14 are located (see Fig . i). If the press table 2 with the pressure plate 4 moves upwards after the press is switched on, the forms io with the molding compound ii pressed against the fixed punch 29 in the upper part of the press and the molding compound is compressed, so shortly before the end of the Pressing process by the roller holder 26, which lifts the lever ih, the lever 16 brought into a different position (see. Fig.2). As a result of the resulting shift in pressure point, the spring 21 connected to the lever 16 pulls it even further to the left and thus also the tab 23 connected to the upper part of the lever pulls the slide 5 from its previous position, so that the part protruding from the pressure plate of the Ejector pins 14 come to rest next to the openings 13 in the slide (Fig.2). If the pressing cycle is now finished and the press is switched to retraction, the ejector pins 14 sit next to the recesses 13 on the slide and thus press the pressed bodies 30 upwards in the molds as the press table goes down further (Fig. 3) . Shortly before reaching the lowest position of the press table 2, the roller holder 27 presses the driver lever 20 and, under the action of the pendulum spring 21, the slide 5 again to the right until the recesses 13 come to stand under the ejector pins 14. The ejector pins then fall down, thereby releasing the mold carrier carriage 8 to extend and remove the finished pressed bodies 30.

Claims (3)

PATENT CLAIMS: i. Method for ejecting compacts from the Compression mold using ejector pins, characterized in that the ejector pins be held when the press table is withdrawn. 2. Ejection device of compacts from their mold using the return of the press or the movement of the press table according to claim i, characterized in that in the pressure plate under the molds in corresponding recesses ejector pins from protruding beyond the pressure plate Length are provided ', their protruding parts from the bores of a movable relative to the press table Element are recorded, with the respective position of this portable Element is controlled by the movement of the press itself so that when closing the press for the purpose of compacting the compacts in the molds, the recesses in the Pressure plate match with those in the portable elements while after completion of the pressing process this correspondence by moving the movable Element is eliminated, so that the protruding parts of the ejector pins the retraction of the press sit on the portable element and then guided into the molds as the decline continues, and so the compacts are pressed out of these, whereupon after completion of this process the portable Element returns to its original position under the influence of the press movement. 3. Apparatus according to claim r and 2, characterized in that under the FormenciffUNGEN a slide provided with corresponding recesses is arranged on the pressure plate and that the press table has projections in the form of cams, rollers or the like, with a lever that engages the slide and is firmly hinged to the press housing come into engagement in such a way that the respective slide position depends on the position of the press table is.